In reply to pec:
> I was talking about road signs!
Well if you are talking about road signs, why do we not use the following instead of some maths equation that most people need to convert in their mind;
Steep (covers anything from 1 in 8 to the following)
Very (covers anything from 1 in 4 to the following) - think Porlock Hill
Extremely (covers 1 in 3 to the following) - think Hardknott Pass
Dangerous (covers all the rest) - think Ffordd Penlech in Harlech
We could put % signs below the main signs to help people who don't have English as a first language.